Truck drivers say they're unsure how freight will be carried between Queensland and the Northern Territory after part of the Barkly Highway was washed away by floods.

Michelle Nykamp, a truck driver who became stranded on the Barkly Highway west of Camooweal, told ABC's Penny Timms, there's a massive section of the road missing at Soudan Station and it's been replaced by a large volume of fast-flowing water.

She said there's no other direct route the drivers can use to travel between the two states and is unsure what it will mean for truck drivers.